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The stability of merwinite in the system CaO-MgO-SiO2-H2O-CO2 with CO2-poor fluids
Springer Science and Business Media LLC - Tập 112 - Trang 385-392
Jincheng Zhou, L. C. Hsu
The stability of merwinite (Mw) and its equivalent assemblages, akermanite (Ak)+calcite (Cc), diopside (Di)+calcite, and wollastonite (Wo)+monticellite (Mc)+calcite was determined at T=500–900° C and P f=0.5–2.0 kbar under H2O−CO2 fluid conditions with X CO 2=0.5, 0.1, 0.05, and 0.02. Merwinite is stable at P f=0.5 kbar with T>700° C and X CO 2<0.1. At P f=2.0 kbar, the assemblage Di+Cc replaces m...... hiện toàn bộ
Phosphorus zoning as a recorder of crystal growth kinetics: application to second-generation olivine in mantle xenoliths from the Cima Volcanic Field
Springer Science and Business Media LLC - - 2017
Ioannis Baziotis, Paul D. Asimow, Theodoros Ntaflos, J. W. Boyce, F. M. McCubbin, C. Koroneos, Diego Perugini, Stephanie Flude, Michael Storey, Yongsheng Liu, Stephan Klemme, Jasper Berndt
Geochemical investigation of a semi-continuous extrusive basaltic section from the Deccan Volcanic Province, India: implications for the mantle and magma chamber processes
Springer Science and Business Media LLC - Tập 159 - Trang 839-862 - 2009
Kopparapu Vijaya Kumar, Chakradhar Chavan, Sariput Sawant, K. Naga Raju, Prachiti Kanakdande, Sangita Patode, Krishna Deshpande, S. K. G. Krishnamacharyulu, T. Vaideswaran, V. Balaram
Spatial and temporal variations in the geochemistry of an extrusive basaltic section of Deccan traps record progressive changes in mantle melting and crustal filtration and are relevant to understand continental flood basalt (CFB) magmatism. In the present work we have carried out detailed field, petrographic, density and magnetic susceptibility, and geochemical investigations on a small, semi-con...... hiện toàn bộ
Diffusion gradients in an eclogite xenolith from the Roberts Victor kimberlite pipe: (2) kinetics and implications for petrogenesis
Springer Science and Business Media LLC - Tập 105 - Trang 637-649 - 1990
Violaine Sautter, Ben Harte
In a bimineralic eclogite xenolith (sample JJG41) from the Roberts Victor kimberlite, compositional gradients in clinopyroxene are related to garnet exsolution. Two principal reactions involving clinopyroxene and garnet occur: (i) The net-transfer Al2Si-1Mg-1 which is responsible for garnet growth according to the equation 2Di+Al2Si-1Mg-1=Grossular+MgCa-1 (reaction 1). This has created substantial...... hiện toàn bộ
Evidence for non-lithostatic pressure in subducted continental crust
Springer Science and Business Media LLC - Tập 175 - Trang 1-15 - 2019
J. A. Cutts, M. A. Smit, J. C. Vrijmoed
Continental crust buried during collisional orogeny typically records pressures of 3 GPa or lower; however, pressures much higher than this are recorded locally, which would suggest burial to mantle depths. Deep continental subduction is not observed in active orogens and should be hindered by the positive buoyancy of sialic crust relative to the mantle. Non-lithostatic pressure caused by mechanic...... hiện toàn bộ
The origin of island arc high-alumina basalts
Springer Science and Business Media LLC - - 1987
Anthony J. Crawford, Trevor J. Falloon, Stephen Eggins
Noritic dykes of southern West Greenland: early Proterozoic boninitic magmatism
Springer Science and Business Media LLC - Tập 97 - Trang 169-182 - 1987
R. Peter Hall, David J. Hughes
Two major swarms of early Proterozoic (ca. 2.1 Ga) basic dykes occur within the Archaean craton of southern West Greenland. One swarm comprises ophitic and sub-ophitic tholeiitic dolerites, while the other (the BN dyke swarm) constitutes mainly norites in which pyroxenes and olivine are enclosed by plagioclase oikocrysts. The close geochemical similarity between a quenched norite and the coarser-g...... hiện toàn bộ
The geochemical effects of olivine slurry replenishment and dolostone assimilation in the plumbing system of the Franklin Large Igneous Province, Victoria Island, Arctic Canada
Springer Science and Business Media LLC - Tập 169 - Trang 1-18 - 2015
Ben Hayes, C. Johan Lissenberg, Jean H. Bédard, Charlie Beard
The Neoproterozoic (~723–716 Ma) Franklin Large Igneous Province exposed on Victoria Island in the Canadian Arctic is comprised of a sill-dominated magma plumbing system overlain by the coeval Natkusiak flood basalts. We have investigated three sections, separated by a total of >50 km of distance, of a sill (the Fort Collinson Sill Complex) emplaced just above a prominent sedimentary marker unit. ...... hiện toàn bộ
The Bayesian approach to an internally consistent thermodynamic database: theory, database, and generation of phase diagrams
Springer Science and Business Media LLC - Tập 133 Số 1 - Trang 149-168 - 1998
Chatterjee, Niranjan D., Krüger, Ralf, Haller, Gerd, Olbricht, Walter
An internally consistent thermodynamic dataset has been derived for 148 endmember phases (145 solids and 3 fluids) comprising the elements Li, Na, K, Be, Mg, Ca, Ti, Cr, Mn, Fe, Zn, Al, Si, C, H, and O. This has been achieved by simultaneous treatment of phase property (like standard enthalpy of formation, standard entropy, molar heat capacity, molar volume, thermal expansivity, bulk modulus etc.)...... hiện toàn bộ
Magmatic and hydrothermal R.E.E. fractionation in the Xihuashan granites (SE China)
Springer Science and Business Media LLC - Tập 104 - Trang 668-680 - 1990
Patricia Maruéjol, Michel Cuney, Laurent Turpin
The Xihuashan stock (South Jiangxi, China) is composed of cogenetic granitic units (granites Xe, γa, γc, γd and γb) and emplaced during the Yanshanian orogeny (153±0.2 Ma). They are two feldspars, Fe-rich biotite±garnet and slightly peraluminous granites. Primary accessory minerals are apatite 1, monazite, zircon, uranothorite±xenotime in granites Xe and γa, zircon, uranothorite, uraninite, betafi...... hiện toàn bộ
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